Routing of an emergency cellular telephone call

Details Routing of an emergency cellular telephone call Routing of an emergency cellular telephone call

1996-01-30

1998-08-18

Bost, Dwayne

Telecommunications

Radiotelephone system

Emergency or alarm communication

455432, 455439, 455445, 455560, H04Q 722

Patent

active

057970939

ABSTRACT:
A cellular telephone network including a plurality of service areas each served by a different mobile switching center wherein messages are transmitted between mobile switching centers, accounting for instances of inter-service area handoff of a mobile subscriber cellular call, to identify the public safety answering point (PSAP) system to be utilized in answering an emergency telephone call from the mobile subscriber. When multiple inter-service area handoffs have occurred, the PSAP identification message is sent from the serving mobile switching center to the anchor mobile switching center to allow for the identification of the appropriate PSAP. This message could be relayed through one or more intermediate tandem mobile switching centers.

REFERENCES:
patent: 4916728 (1990-04-01), Blair
patent: 5153902 (1992-10-01), Buhl et al.
patent: 5369681 (1994-11-01), Boudreau et al.
patent: 5369684 (1994-11-01), Buhl et al.
patent: 5388147 (1995-02-01), Grimes
patent: 5519760 (1996-05-01), Borkowski et al.
patent: 5561840 (1996-10-01), Avesalo et al.

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